1. Measure the spacings between the timber studs and cut the Mannok Therm Wall / MW insulation boards if required to ensure a tight fit between the studs

2. Install the wall insulation boards between the studs and to door and window framing, ensuring they are lightly butted to give continuity of insulation

3. Fill any gaps between the insulation and studs with expanding polyurethane foam

4. Install softwood timber battens flush with the timber studs to act as a stop and prevent the insulation boards from moving within the stud cavity.

5. Depending on the depth and spacing of the studs and the U-value required of the wall, an additional layer of Mannok Therm Wall / MW or Mannok Therm Laminate-Kraft / MLK insulation boards may be required, fixed across the inner face of the studs.

6. Timber framed walls require a vapour control layer to prevent damaging interstitial condensation forming on the back of the sheathing. Where a continuous layer of Mannok Therm Wall / MW insulation is fitted across the inner face of the studs, this vapour control layer may be formed by taping the joints between boards with metalised tape.

Where Mannok Therm Wall / MW insulation boards are fitted only between the studs a vapour resistant membrane, such as 500 gauge polyethylene, should be installed across the outer face of the studs.

Condensation risk analysis should be carried out to ensure the specified AVCL has a sufficiently high vapour resistance for the project.

7. A service cavity can be formed by fitting plasterboard on battens, rather than nailing directly to the studs. Electrical and other services can then be run in the cavity without compromising the vapour control layer.

8. The outer masonry leaf should be constructed in the conventional manner and secured using appropriate wall ties.